While that is true to the show, Project Horizons refers to it as a contrabass. The contrabass is very commonly used instead of the instrument's actual name, the double-bass. However, this may just be a mistake on the part of Somber and/or his editors.

Nevermind, now that I've read far enough, and know that the instrument is indestructible (essentially), I strongly desire to see Blackjack using the unbreakable instrument to bludgeon enemies to death XD

FOE is short for Fallout Equestria, a very good fan fiction series of MLP set in Fallout. While Project Horizons is a separate fan fiction from the original story, but set in the same world, also very good. I recommend both for a good read. Word count has already beaten Lord of the Rings with just the original story alone o.o

If you have the inclination, may I suggest a shot of BJ and Captain Thrush wearing a rum bottle and a whiskey bottle respectively, and identical drunk grins? I just got to that bit and I'm trying to keep from laughing my plot off in the middle of work.